CN102447658A - Method and device for suppressing and merging interference - Google Patents

Abstract

The invention discloses a method and a device for suppressing and merging interference, wherein the method comprises the steps that: pilot frequency subcarriers on all the resources blocks in the signal which is received by all the antennas are separated into pilot frequency groups; cross-correlation calculation is carried out on the pilot frequency groups which are formed by the pilot frequency subcarriers on the same positions of the resource blocks of different antennas, so the components of all the elements of an interference and noise correlation matrix are obtained; all the elements are obtained according to the components of all the elements; and the interference and noise correlation matrix is used for suppressing and merging the interference of the data subcarriers on all the antennas. According to the invention, the estimation precision of the interference and noise correlation matrix is improved.

Description

Disturb the method and the device that suppress merging

Technical field

The present invention relates to the communications field, in particular to a kind of method and device that suppresses merging that disturb.

Background technology

OFDM (Orthogonal Frequency Division Multiplexing abbreviates OFDM as) technology is a kind of multi-carrier digital modulation technique, also is simultaneously a kind of channeling technology.Than other modulation techniques and multiplex technique; The OFDM technology has spectrum utilization efficiency and good anti-multipath interference performance efficiently; Therefore; Be widely used in the audio frequency, video field and military, commercial signal communication system of broadcast type; Its main application comprises: high bitrate digital subscriber line system (High-speed Digital Subscriber Line abbreviates HDSL as), asymmetrical DSL (Asymmetric Digital Subscriber Line abbreviates ADSL as), (the European Telecommunications Standards Institute of ETSI; Abbreviate ETSI as) digital audio broadcasting (the Digital Audio Broadcasting of standard; Abbreviate DAB as), DVB (Digital Video Broadcasting abbreviates DVB as), high definition TV (High Definition Television abbreviates HDTV as), wireless MAN (Wireless Metropolitan Area Network; Abbreviate WMAN as) and WLAN (Wireless Local Area Network abbreviates WLAN as) or the like.Particularly in wireless MAN (WMAN) and wireless lan (wlan) field, obtained extensive application as Main physical layer technological 802.16 series and 802.11 series standard with the OFDM technology.

Multiple-input and multiple-output (Multiple-Input Multiple-Output abbreviates MIMO as) technology is meant at the transmitting terminal of wireless communication system and receiving terminal uses a plurality of transmitting antennas and reception antenna respectively.The MIMO technology is the important breakthrough of wireless mobile communications field intelligent antenna technology, can under the situation that does not increase bandwidth, improve the capability of communication system and the availability of frequency spectrum exponentially, and the reliability that can improve system, reduces the error rate.The MIMO technology has become one of key technology of wireless communication field; Aspect the WiMAX GSM; Third generation partner program (3rd Generation Partnership Project; Abbreviate 3GPP as) in standard, added the relevant content of MIMO technology, in the system of B3G and 4G also with using MIMO technique; In wireless broadband access system, the 802.16e that is working out, 802.11n and standards such as 802.20 have also adopted the MIMO technology; In other Research of wireless communication systems, for example ultra broadband (Ultra Wide Band abbreviates UWB as) system and system for cognitive radio systems such as (Cognitive Radio abbreviate CR as) are all considering using MIMO technique.According to the transmitting-receiving two-end antenna amount; With respect to the common single output of single input (Single-Input Single-Output; Abbreviate SISO as) system; Adopt the system of MIMO technology can also comprise single many outputs of input (Single-Input Multi-Output abbreviates SIMO as) and many single outputs of input (Multi-Input Single-Output abbreviates MISO as).

OFDM technology and MIMO technology all have good performance separately; Can both improve the performance of wireless communication system significantly; So people expect the two is combined naturally, so not only can remedy the shortcoming that the two exists separately, make that also both sides' advantage is better brought into play simultaneously; Develop frequency spectrum resource and space resources more efficiently, further improved the spectrum utilance and the reliability of system.Therefore, in the next generation wireless communication technology, various standards and agreement all with OFDM+MIMO as physical layer base band signal process scheme.

Adopt the general wideer bandwidth of wireless communication system more in the past that adopts of wireless communication system of OFDM technology; Therefore; Tend to adopt the identical networking mode to carry out the network planning and construction; The inevitable existence of this moment with disturbing (generally also being referred to as common-channel interference, adjacent area interference) frequently, particularly on up (oppositely) direction.For the influence that reduces to disturb, improve power system capacity, guarantee system reliability that people have been developed multiple technologies in various aspects such as the network planning, the network optimization, scheduling of resource, air protocol with frequently.But be subject to limited ground frequency spectrum resource, system equipment ability and technical bottleneck, still can exist with disturbing frequently, this will inevitably interfere with normal baseband signal and receive and handle, and finally also need resist with disturbing frequently baseband signal in physical layer and handle.For the multiaerial system that adopts the MIMO technology, when it adopts space diversity reception to communicate, need do to merge to the reception signal on each antenna and handle.People have been developed interference and have been suppressed to merge (Interference Rejection Combining; Abbreviating IRC as) technology is applied to this merging process; In the hope of suppressing effectively with disturbing frequently; Improve the Signal Interference and Noise Ratio (Signal-Interference-and-Noise-Ratio abbreviates SINR as) of amalgamation result signal.

The IRC technology is the optimum linearity merge algorithm under maximum signal noise ratio principle, and its weighting weight vector is derived through maximum signal noise ratio principle, asks for the correlation matrix that process need utilizes interference plus noise between each antenna.But in communication system, useful signal and interference plus noise are aliasing in together; For ofdm system; After useful signal and interference plus noise pass through the fast Fourier transform conversion jointly, be aliasing on each subcarrier, therefore be difficult to directly try to achieve the correlation matrix of interference plus noise.At number of patent application is that CN200910244004.3, name are called in the patent application of " a kind of interference rejection combining method and system ", has introduced the principle of IRC algorithm.The scheme of this patent introduction is to obtain the estimator of interference plus noise signals through receiving the estimator that signal deducts useful signal, and then asks for the estimated value of the correlation matrix of interference plus noise.This method is simple and clear, and still, the inventor finds, when asking for the estimator of useful signal, can use the estimator of channel coefficients.In general, having under the interference plus noise condition, the estimator of trying to achieve channel coefficients all is inaccurate, has wherein comprised the influence of interference plus noise.Therefore, the estimated value of using the said method of this patent to try to achieve the correlation matrix of interference plus noise exists than mistake, and then makes the weighting weight vector of trying to achieve comprise than mistake, causes and can not good restraining disturb and noise, and this has directly influenced the merging performance.The patent No. is that EP2136521A1, name are called " Method; Device and system using interference rejectioncombining in OFDMA " patent start with from improving precision of channel estimation, still, with present technical merit; According to existing system and standard; The raising cost of precision of channel estimation is bigger, and performance boost is limited.In the patent No. is that WO2009060023A2, name are called in the patent of " METHOD AND APPARATUS FOR INTERFERENCE REJECTION COMBINING AND DETECTION "; Adopted the IRC algorithm; But the information that needs known adjacent area to disturb, this point is difficult in real-time implementation in the real system.

The inventor finds, disturbing when suppressing to merge accuracy lower in the correlation technique.

Summary of the invention

Main purpose of the present invention is to provide a kind of scheme that suppresses merging of disturbing, the lower problem of accuracy when disturbing inhibition to merge in the above-mentioned correlation technique to solve at least.

To achieve these goals, according to an aspect of the present invention, a kind of method that suppresses merging of disturbing is provided, this method comprises: the pilot sub-carrier on each Resource Block in the signal that receives on each root antenna is divided into pilot group respectively; Pilot group to the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation, obtains disturbing the component with each element of noise correlation matrix; Component according to each element obtains each element; Using interference and noise correlation matrix that the data subcarrier on each root antenna is disturbed suppresses to merge.The present invention has improved the estimated accuracy of interference plus noise correlation matrix.

Further, the pilot group of the pilot sub-carrier of the same position on the same Resource Block on the different antennae being formed is carried out computing cross-correlation and is comprised: estimate the domain channel response value on each pilot sub-carrier; The domain channel response value of the pilot sub-carrier in the pilot group that the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each pilot group.

To achieve these goals; According to another aspect of the present invention; A kind of device that suppresses merging that disturbs is provided, and this device comprises: grouping module is used for the pilot sub-carrier on each Resource Block of the signal that receives on each root antenna is divided into pilot group respectively; Computing module is used for the pilot group that the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation, obtains disturbing the component with each element of noise correlation matrix; Acquisition module is used for obtaining each element according to the component of each element; Disturb and suppress to merge module, be used to use interference and noise correlation matrix that the data subcarrier on each root antenna is disturbed and suppress to merge.

Further, computing module comprises: the estimator module is used to estimate the domain channel response value on each pilot sub-carrier; The operator module, the domain channel response value of the pilot sub-carrier of the pilot group that is used for the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each pilot group.

Through the present invention, adopt interference plus noise correlation matrix estimation mode based on pilot tone, eliminate the influence of interference plus noise in the interference plus noise correlation matrix estimation process, thereby improved the estimated accuracy of interference plus noise correlation matrix.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart according to the interference rejection combining method of the embodiment of the invention;

Fig. 2 is the sketch map according to the ofdm system of the embodiment of the invention;

Fig. 3 is the time-frequency two-dimensional structure chart according to the ofdm signal of the embodiment of the invention;

Fig. 4 is the structured flowchart that suppresses the device of merging according to the interference of the embodiment of the invention;

Fig. 5 is the structured flowchart according to the computing module 44 of the embodiment of the invention.

Embodiment

Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.

Embodiment one

The embodiment of the invention provides a kind of method that suppresses merging of disturbing, and this method is applied to adopt in the wireless communication field many antennas ofdm system of MIMO technology.Fig. 1 is the flow chart according to the interference rejection combining method of the embodiment of the invention, and this method comprises:

Step S102 is divided into pilot group respectively with the pilot sub-carrier on each Resource Block in the signal that receives on each root antenna;

For example, base station or terminal receive signal through antenna, then, the pilot sub-carrier on each Resource Block in the signal that receives on each root antenna are divided into pilot group respectively.

Step S104 carries out computing cross-correlation to the pilot group that the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed, and obtains disturbing the component with each element of noise correlation matrix;

Step S106 is according to each element of component acquisition of each element;

Step S108 uses interference and noise correlation matrix that the data subcarrier on each root antenna is disturbed and suppresses to merge.

Wherein, step S108 can adopt this area universal mode to disturb inhibition to merge, and to its concrete implementation, the present invention does not do qualification.

Present embodiment adopts the interference plus noise correlation matrix estimation mode based on pilot tone; Compare with method in the past; Present embodiment can estimate to disturb the correlation matrix with noise more accurately; And then accomplish to disturb and suppress to merge, play the effect that suppresses with disturbing frequently, improving received signal quality and elevator system overall performance.

Preferably, step S104 can realize in the following manner: estimate the domain channel response value on each pilot sub-carrier; The domain channel response value of the pilot sub-carrier in the pilot group that the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each pilot group.

Wherein, the relation between the estimated value of domain channel response value on each pilot sub-carrier and the domain channel response value on each pilot sub-carrier is:

Wherein, H _1,1Be pilot sub-carrier P _1,1Corresponding domain channel response value, H _1,2Be pilot sub-carrier P _1,2Corresponding domain channel response value, H _3,1Be pilot sub-carrier P _3,1Corresponding domain channel response value, H _3,2Be pilot sub-carrier P _3,2Corresponding domain channel response value,

Be pilot sub-carrier P _1,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _1,2The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,2The estimated value of corresponding domain channel response value, ε ₁And ε ₂Be the physical quantity of setting, these two values can't know for sure, are the signs of setting for algorithm is derived, and can disappear W at last in calculating _1,1Be pilot sub-carrier P _1,1The channel estimation errors that corresponding interference plus noise causes, W _1,2Be pilot sub-carrier P _1,2The channel estimation errors that corresponding interference plus noise causes, W _3,1Be pilot sub-carrier P _3,1The channel estimation errors that corresponding interference plus noise causes, W _3,2Be pilot sub-carrier P _3,2The channel estimation errors that corresponding interference plus noise causes.

After the domain channel response value on estimating each pilot sub-carrier, use formula

Calculate the cross correlation value estimated value R of antenna m and antenna n _{Mn, Ns}, wherein,

As s=1,2,3 or 4 the time,

When s=5 or 6,

H _{L, k, m}Be the H of antenna m _{L, k}, H _{P, q, m}Be the H of antenna m _{P, q}, H _{L, k, n}Be the H of antenna n _{L, k}, H _{P, q, n}Be the H of antenna n _{P, q}, when s=1, l=1, k=1, p=1, q=2, when s=2,1=3, k=1; P=3, q=2, when s=3, l=1, k=1, p=3, q=1 is when s=4; L=1, k=2, p=3, q=2, when s=5, l=1, k=1, p=3; Q=2, when s=6, l=1, k=2, p=3, q=1, N represent to disturb and noise signal, and C representes the signal that receives.

Then, according to R _{Mn, N}=R _{Mn, N1}+ R _{Mn, N2}+ R _{Mn, N3}+ R _{Mn, N4}-R _{Mn, N5}-R _{Mn, N6}Obtain disturbing each element with noise correlation matrix, thereby obtain whole interference and noise correlation matrix.

Compared with prior art; Present embodiment can estimate to disturb the correlation matrix with noise more accurately; And then can estimate more accurately to disturb and suppress to merge (IRC) weight vector, obtain better amalgamation result, and have higher Signal Interference and Noise Ratio (SINR); Simultaneously, improve the performance of physical link layer and the overall performance of elevator system.

Embodiment two

Fig. 2 is the sketch map according to the ofdm system of the embodiment of the invention.Wherein, show the composition of ofdm system physical layer baseband signal processing unit and the flow process of signal processing.As shown in Figure 2, this system mainly is made up of several parts such as antenna system module, radio frequency/intermediate frequency processing unit module, baseband processing unit module and other processing unit modules.Wherein, acting as of antenna system module receives the electromagnetic wave signal of propagating in the space, and is translated into the signal of telecommunication; The radio frequency/intermediate frequency processing unit module comprises processing such as filtering, shaping, AD conversion, and the output digital signal is given the baseband processing unit module; The baseband processing unit module comprises FFT (Fast Fourier Transform abbreviates FFT as) module, baseband signal pretreatment unit module, IRC module (many antennas merging processing unit module) and demodulation decoding module again, wherein; The effect of FFT module is the time-domain digital signal of radio frequency/IF processing unit module output to be FFT handle; Thereby obtain frequency-region signal, the effect of baseband signal pretreatment unit module is that the frequency-region signal of FFT module output is done the preliminary treatment that possibly need, for example; At micro-wave access to global intercommunication (Worldwide Interoperability for Microwave Access; Abbreviate WiMAX as) need do descrambling code in the system and handle, the effect of IRC module is the frequency-region signal of each antenna to be done to disturb suppress to merge, and obtains many antennas amalgamation result; At last; Accomplish demodulation coding by the demodulation coding module, so far accomplish base band signal process, the output decode results is handled to other; Other processing are general designations of above each layer processing of physical layer, and this patent content does not relate to, and does not do at this and gives unnecessary details.

The interference rejection combining method that present embodiment provides is applied in the multi-antenna orthogonal frequency division multiplexing system shown in Figure 2; And be mainly used in IRC module wherein; Realization obtains IRC then and merges weight vector the estimation of interference and noise correlation matrix, and final completion is disturbed inhibition to merge and handled.

Fig. 3 is the time-frequency two-dimensional structure chart according to the ofdm signal of the embodiment of the invention, and is as shown in Figure 3, and ofdm signal comprises a plurality of symbols and a plurality of subcarriers on the frequency domain on the time domain.Experimental process carrier wave on the time-frequency two-dimensional plane is formed a Resource Block, and subcarrier wherein comprises the data subcarrier and the pilot sub-carrier that is used for synchronous and channel estimating etc. that is used to transmit data.In general, pilot configuration as shown in Figure 3.The embodiment of the invention utilizes the signal on the pilot sub-carrier to estimate interference and noise correlation matrix on all subcarriers on this Resource Block; And then through calculating the merging weight vector, the data subcarrier that is applied to again on this Resource Block disturbs inhibition to merge.The implementation step of the interference rejection combining method in the embodiment of the invention comprises:

1, the pilot sub-carrier on the Resource Block is divided into groups.

In Fig. 3, R _{I, j}The representative data subcarrier, P _{I, j}Represent pilot sub-carrier, wherein, i is the numbering of OFDM symbol in the time frequency unit, and j is the numbering of interior data subcarrier of the same OFDM symbol of a time frequency unit or pilot sub-carrier.Pilot sub-carrier P _1,1And P _1,2Lay respectively on interior first frequency of first OFDM symbol and the 4th frequency, constitute first group of pilot sub-carrier; Pilot sub-carrier P _3,1And P _3,2Lay respectively on interior first frequency of the 3rd OFDM symbol and the 4th frequency, constitute second group of pilot sub-carrier; P _1,1And P _3,1Constitute the 3rd group of pilot sub-carrier; P _1,2And P _3,2Constitute the 4th group of pilot sub-carrier; P _1,1And P _3,2Constitute the 5th group of pilot sub-carrier; P _1,2And P _3,1Constitute the 6th group of pilot sub-carrier.For multiaerial system, the reception signal on every antenna has all occupied identical time, therefore, can in the letter sign, add a subscript again and represent the antenna sequence number.

2, the domain channel response value on the estimating pilot frequency subcarrier.

Present embodiment does not relate to specific channel estimation method and scheme, just utilizes the channel response value estimated result.In the present embodiment, it is following to establish in the Resource Block channel response value model:

4 pilot sub-carriers, i.e. P are arranged among Fig. 3 _1,1, P _1,2, P _3,1, P _3,2, its corresponding domain channel response value is respectively H _1,1, P _1,2, H _3,1, H _3,2, and, unequal mutually between each domain channel response value, and domain channel response value estimated value is respectively

If H _1,1With H _1,2Between the domain channel response variable quantity be ε ₁H _1,1With H _3,1Between time channel variation amount be ε ₂, then:

$\left\{\begin{array}{c}{H}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+{\mathrm{\ϵ}}_1\\ H_{\mathrm{3,1}}=H_{\mathrm{1,1}}+{\mathrm{\ϵ}}_2\end{array}\right.---\left(1\right)$

On frequency domain near the time dependent variable quantity approximately equal of domain channel response of subcarrier, so H _1,2With H _3,2Between also satisfy following relation:

H _3，2＝H _1，2+ε ₂ (2)

Domain channel response value estimated value

corresponding on the pilot sub-carrier can be expressed as:

${\hat{H}}_{i,j}=H_{i,j}+W_{i,j}---\left(3\right)$

Formula (3) has been described

With H _{I, j}Between relation, wherein, W _{I, j}The channel estimation errors that the expression interference plus noise causes.

Formula (3), formula (1) and formula (2) are combined, obtain domain channel response value estimated value corresponding on four pilot sub-carriers and be respectively:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.---\left(4\right)$

When handling the data of many antennas, also need in the letter sign, add a subscript again and represent the antenna sequence number.

3, calculate the interference and the noise correlation estimated value of each pilot subcarrier sets.

The interference on certain number of sub-carrier or the Resource Block and the cross-correlation matrix of noise signal should be to do the conjugation multiplication through interference on the corresponding subcarrier and noise signal to calculate; But because useful signal cannot separate with noise signal with interference, this direct acquiring method can not be realized.And present embodiment has utilized top channel model; Ask for the interference and the noise cross correlation value estimated value of each pilot subcarrier sets respectively; In results added with each pilot subcarrier sets; Eliminated the influence of error amount, can obtain like this than disturb more accurately and noise correlation matrix from general approach.Introduce the interference of each pilot subcarrier sets and the computational methods of noise cross correlation value estimated value below.

Suppose to ask for the cross correlation value estimated value of antenna m and antenna n, that is, and the element of the capable n row of the m of correlation matrix.

To first pilot subcarrier sets, the cross correlation value that receives signal is that the cross correlation value of

and is:

$R_{\mathrm{mn},1}=\underset{j=1}{\overset{2}{\mathrm{\Σ}}}\left[{\hat{H}}_{1,j,m}{\hat{H}}_{1,j,n}^{*}\right]---\left(5\right)$

and The estimate of the signal cross-correlation value is:

${\hat{R}}_{\mathrm{mn},C1}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{1,2},n}^{*}+{\hat{H}}_{\mathrm{1,2},m}{\hat{H}}_{\mathrm{1,1},n}^{*}---\left(6\right)$

Therefore, the estimated value of the interference plus noise cross correlation value in

and

is:

${\hat{R}}_{\mathrm{mn},N1}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}---\left(7\right)$

and The actual signal cross-correlation values are:

$R_{\mathrm{mn},C1}=\underset{j=1}{\overset{2}{\mathrm{\Σ}}}\left[H_{1,j,m}{H}_{1,j,n}^{*}\right]---\left(8\right)$

Because actual domain channel response can't be known, therefore can't directly use (8) to ask for R _{Mn, C1}Using the estimated value of signal power

of the interference plus noise correlation value is calculated on the introduction of the error

Further have by (6) formula

${\hat{R}}_{\mathrm{mn},C1}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,2},n}^{*}+H_{\mathrm{1,2},m}+H_{\mathrm{1,1},n}^{*}+U_{\mathrm{mn},1}---\left(9\right)$

U in the following formula _{Mn, 1}Be the result that the gaussian variable of many zero-means adds up, can think U _{Mn, 1}Be approximately zero.Therefore obtain

${\hat{R}}_{\mathrm{mn},C1}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,2},n}^{*}+H_{\mathrm{1,2},m}{H}_{\mathrm{1,1},n}^{*}---\left(10\right)$

The error of the calculating introducing of interference plus noise cross correlation value is carried out in use

:

$R_{\mathrm{mn},C1}-{\hat{R}}_{\mathrm{mn},C1}=(H_{\mathrm{1,1},m}-H_{\mathrm{1,2},m})(H_{\mathrm{1,1},n}^{*}-H_{\mathrm{1,2},n}^{*})={\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(11\right)$

Therefore,

With

The cross correlation value R of the interference plus noise of middle reality _{Mn, N1}For:

$R_{\mathrm{mn},N1}=R_{\mathrm{mn},1}-R_{\mathrm{mn},C1}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}-{\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(12\right)$

In like manner, can obtain

With The cross correlation value R of the interference plus noise of middle reality _{Mn, N2}For:

$R_{\mathrm{mn},N2}=R_{\mathrm{mn},2}-R_{\mathrm{mn},C2}=R_{\mathrm{mn},2}-{\hat{R}}_{\mathrm{mn},C2}-{\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(13\right)$

And the cross correlation value of the 3rd actual interference plus noise in pilot subcarrier sets and the 4th pilot subcarrier sets

$R_{\mathrm{mn},N3}=R_{\mathrm{mn},3}-R_{\mathrm{mn},C3}=R_{\mathrm{mn},3}-{\hat{R}}_{\mathrm{mn},C3}-{\mathrm{\ϵ}}_{2,m}{\mathrm{\ϵ}}_{2,n}^{*}---\left(14\right)$

$R_{\mathrm{mn},N4}=R_{\mathrm{mn},4}-R_{\mathrm{mn},C4}=R_{\mathrm{mn},4}-{\hat{R}}_{\mathrm{mn},C4}-{\mathrm{\ϵ}}_{2,m}{\mathrm{\ϵ}}_{2,n}^{*}---\left(15\right)$

To the 5th pilot subcarrier sets, the cross correlation value of

and

is:

$R_{\mathrm{mn},5}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{1,1},n}+{\hat{H}}_{\mathrm{3,2},m}{\hat{H}}_{\mathrm{3,2},n}---\left(16\right)$

and

the signal cross-correlation value estimate

is:

${\hat{R}}_{\mathrm{mn},C5}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{3,2},n}^{*}+{\hat{H}}_{\mathrm{3,2},m}{\hat{H}}_{\mathrm{1,1},n}^{*}---\left(17\right)$

and

the actual signal cross-correlation values are:

$R_{\mathrm{mn},C5}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,1},n}^{*}+H_{\mathrm{3,2},m}{H}_{\mathrm{3,2},n}^{*}---\left(18\right)$

The error of the calculating introducing of interference plus noise cross correlation value is carried out in use

:

$R_{\mathrm{mn},C5}-{\hat{R}}_{\mathrm{mn},C5}=({\mathrm{\ϵ}}_{1,m}+{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}+{\mathrm{\ϵ}}_{2,n})}^{*}---\left(19\right)$

Therefore, the estimated value of the cross correlation value of the interference plus noise in

and

is:

$R_{\mathrm{mn},N5}=R_{\mathrm{mn},5}-R_{\mathrm{mn},C5}=R_{\mathrm{mn},5-}{\hat{R}}_{\mathrm{mn},C5}-({\mathrm{\ϵ}}_{1,m}+{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}+{\mathrm{\ϵ}}_{2,n})}^{*}---\left(20\right)$

In like manner, can obtain the interference plus noise cross correlation value in

and

:

$R_{\mathrm{mn},N6}=R_{\mathrm{mn},6}-R_{\mathrm{mn},C6}=R_{\mathrm{mn},6-}{\hat{R}}_{\mathrm{mn},C6}-({\mathrm{\ϵ}}_{1,m}-{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}-{\mathrm{\ϵ}}_{2,n})}^{*}---\left(21\right)$

4, the interference of each pilot subcarrier sets and noise correlation estimated value are carried out algebraic operation and obtain final result.

R _mn，N＝R _mn，N1+R _mn，N2+R _mn，N3+R _mn，N4-R _mn，N5-R _mn，N6 (22)

R _mn，N＝R _mn，1-R _mn，C1+R _mn，2-R _mn，C2+R _mn，3-R _mn，C3+R _mn，4-R _mn，C4-R _mn，5

(23)

+R _mn，C5-R _mn，6+R _mn，C6

$R_{\mathrm{mn},N}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}+R_{\mathrm{mn},2}-{\hat{R}}_{\mathrm{mn},C2}+R_{\mathrm{mn},3}-{\hat{R}}_{\mathrm{mn},C3}+R_{\mathrm{mn},4}-{\hat{R}}_{\mathrm{mn},C4}-R_{\mathrm{mn},5}$ (24)

$+{\hat{R}}_{\mathrm{mn},C5}-R_{\mathrm{mn},6}+{\hat{R}}_{\mathrm{mn},C6}$

Since when utilizing formula (23) to calculate, ε ₁And ε ₂The capital is disappeared, and therefore, formula (23) is of equal value with formula (24).All numerical value all can calculate in the formula (24), thereby finally try to achieve antenna m and interference and the noise cross correlation value estimated value R of antenna n on Resource Block _{Mn, N}, m and n are circulated, get different values, can obtain whole correlation matrix R _N

It should be noted that; Present embodiment is that example describes with the OFDM shown in Fig. 3 only; But the application of present embodiment is not limited to ofdm signal shown in Figure 3, so long as pilot sub-carrier is positioned on four angles of Resource Block or pilot sub-carrier can divide into groups according to laterally, vertically reaching the diagonal angle; Can use the method for present embodiment to carry out the estimation of correlation matrix, suppress to merge thereby disturb.

The embodiment of the invention also provides a kind of device that suppresses merging that disturbs, and this device is used to realize said method, and this device can be arranged in the equipment that terminal, base station etc. have many antennas, and this device can be positioned on the signal-processing board of each equipment.

Fig. 4 is the structured flowchart that suppresses the device of merging according to the interference of the embodiment of the invention, and this device comprises: grouping module 42 is used for the pilot sub-carrier on each Resource Block of the signal that receives on each root antenna is divided into pilot group respectively; Computing module 44 is coupled to grouping module 42, is used for the pilot group that the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation, obtains disturbing the component with each element of noise correlation matrix; Acquisition module 46 is coupled to computing module 44, is used for obtaining each element according to the component of each element; Disturb and suppress to merge module 48, be coupled to acquisition module 46, be used to use interference and noise correlation matrix that the data subcarrier on each root antenna is disturbed and suppress to merge.Wherein, grouping module 42, computing module 44 and acquisition module 46 can be arranged in the IRC module of equipment.

Fig. 5 is that computing module 44 comprises according to the structured flowchart of the computing module 44 of the embodiment of the invention: estimator module 52 is used to estimate the domain channel response value on each pilot sub-carrier; Operator module 54; Be coupled to estimator module 52; The domain channel response value of the pilot sub-carrier of the pilot group that is used for the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each pilot group.

Preferably, the relation between the estimated value of domain channel response value on each pilot sub-carrier and the domain channel response value on each pilot sub-carrier is:

Wherein, H _1,1Be pilot sub-carrier P _1,1Corresponding domain channel response value, H _1,2Be pilot sub-carrier P _1,2Corresponding domain channel response value, H _3,1Be pilot sub-carrier P _3,1Corresponding domain channel response value, H _3,2Be pilot sub-carrier P _3,2Corresponding domain channel response value,

Be pilot sub-carrier P _1,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _1,2The estimated value of corresponding domain channel response value, Be pilot sub-carrier P _3,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,2The estimated value of corresponding domain channel response value, ε ₁And ε ₂Be the physical quantity of setting, these two values can't know for sure, are the signs of setting for algorithm is derived, and can disappear W at last in calculating _1,1Be pilot sub-carrier P _1,1The channel estimation errors that corresponding interference plus noise causes, W _1,2Be pilot sub-carrier P _1,2The channel estimation errors that corresponding interference plus noise causes, W _3,1Be pilot sub-carrier P _3,1The channel estimation errors that corresponding interference plus noise causes, W _3,2Be pilot sub-carrier P _3,2The channel estimation errors that corresponding interference plus noise causes.

Preferably, operator module 54 is used to use formula

Calculate the cross correlation value estimated value R of antenna m and antenna n _{Mn, Ns}, wherein,

As s=1,2,3 or 4 the time,

When s=5 or 6,

Wherein, H _{L, k, m}Be the H of antenna m _{L, k}, H _{P, q, m}Be the H of antenna m _{P, q}, H _{L, k, n}Be the H of antenna n _{L, k}, H _{P, q, n}Be the H of antenna n _{P, q}, N representes to disturb and noise signal, and C representes the signal that receives, when s=1, l=1, k=1, p=1, q=2 is when s=2; L=3, k=1, p=3, q=2, when s=3, l=1, k=1, p=3; Q=1, when s=4, l=1, k=2, p=3, q=2, when s=5, l=1; K=1, p=3, q=2, when s=6, l=1, k=2, p=3, q=1.

Preferably, acquisition module 46 is used to use formula R _{Mn, N}=R _{Mn, N1}+ R _{Mn, N2}+ R _{Mn, N3}+ R _{Mn, N4}-R _{Mn, N5}-R _{Mn, N6}Obtain each element of interference and noise correlation matrix.

The embodiment of the invention is through adopting the interference plus noise correlation matrix estimation mode based on pilot tone; Eliminated the influence of interference plus noise in the interference plus noise correlation matrix estimation process; Thereby improved the estimated accuracy of interference plus noise correlation matrix, and then promoted the entire system performance.

Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. one kind is disturbed the method that suppresses to merge, and it is characterized in that, comprising:

Pilot sub-carrier on each Resource Block in the signal that receives on each root antenna is divided into pilot group respectively;

Pilot group to the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation, obtains disturbing the component with each element of noise correlation matrix;

Component according to said each element obtains said each element;

Using said interference and noise correlation matrix that the data subcarrier on said each root antenna is disturbed suppresses to merge.

2. method according to claim 1 is characterized in that, the pilot group that the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation and comprised:

Estimate the domain channel response value on each pilot sub-carrier;

The said domain channel response value of the pilot sub-carrier in the pilot group that the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each said pilot group.

3. method according to claim 2 is characterized in that,

Relation between the domain channel response value on each pilot sub-carrier and the estimated value of the domain channel response value on each pilot sub-carrier is:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.$

Wherein, H _1,1Be pilot sub-carrier P _1,1Corresponding domain channel response value, H _1,2Be pilot sub-carrier P _1,2Corresponding domain channel response value, H _3,1Be pilot sub-carrier P _3,1Corresponding domain channel response value, H _3,2Be pilot sub-carrier P _3,2Corresponding domain channel response value,

Be pilot sub-carrier P _1,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _1,2The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,2The estimated value of corresponding domain channel response value, ε ₁And ε ₂Be the physical quantity W that sets _1,1Be pilot sub-carrier P _1,1The channel estimation errors that corresponding interference plus noise causes, W _1,2Be pilot sub-carrier P _1,2The channel estimation errors that corresponding interference plus noise causes, W _3,1Be pilot sub-carrier P _3,1The channel estimation errors that corresponding interference plus noise causes, W _3,2Be pilot sub-carrier P _3,2The channel estimation errors that corresponding interference plus noise causes.

4. method according to claim 3 is characterized in that, the said domain channel response value of the pilot sub-carrier in the pilot group that the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation and comprised:

Use formula Calculate the cross correlation value estimated value R of antenna m and antenna n _{Mn, Ns}, wherein,

As s=1,2,3 or 4 the time,

When s=5 or 6, H _{L, k, m}Be the H of antenna m _{L, k}, H _{P, q, m}Be the H of antenna m _{P, q}, H _{L, k, n}Be the H of antenna n _{L, k}, H _{P, q, n}Be the H of antenna n _{P, q}, N representes to disturb and noise signal, and C representes the signal that receives, when s=1, l=1, k=1, p=1, q=2 is when s=2; L=3, k=1, p=3, q=2, when s=3, l=1, k=1, p=3; Q=1, when s=4, l=1, k=2, p=3, q=2, when s=5, l=1; K=1, p=3, q=2, when s=6, l=1, k=2, p=3, q=1.

5. method according to claim 4 is characterized in that, obtains said each element according to the component of said each element and comprises:

Use formula R _{Mn, N}=R _{Mn, N1}+ R _{Mn, N2}+ R _{Mn, N3}+ R _{Mn, N4}-R _{Mn, N5}-R _{Mn, N6}Obtain said each element R _{Mn, N}

6. one kind is disturbed the device that suppresses to merge, and it is characterized in that, comprising:

Grouping module is used for the pilot sub-carrier on each Resource Block of the signal that receives on each root antenna is divided into pilot group respectively;

Computing module is used for the pilot group that the pilot sub-carrier of the same position on the same Resource Block on the different antennae is formed is carried out computing cross-correlation, obtains disturbing the component with each element of noise correlation matrix;

Acquisition module is used for obtaining said each element according to the component of said each element;

Disturb and suppress to merge module, be used to use said interference and noise correlation matrix that the data subcarrier on said each root antenna is disturbed and suppress to merge.

7. device according to claim 6 is characterized in that, said computing module comprises: the estimator module is used to estimate the domain channel response value on each pilot sub-carrier;

The operator module; The said domain channel response value of the pilot sub-carrier of the pilot group that is used for the pilot sub-carrier of the same position on the same Resource Block of different antennae is formed is carried out computing cross-correlation, obtains the relevant estimated value with noise of interference of each said pilot group.

8. device according to claim 7 is characterized in that, the relation between the domain channel response value on each pilot sub-carrier and the estimated value of the domain channel response value on each pilot sub-carrier is:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.$

Wherein, H _1,1Be pilot sub-carrier P _1,1Corresponding domain channel response value, H _1,2Be pilot sub-carrier P _1,2Corresponding domain channel response value, H _3,1Be pilot sub-carrier P _3,1Corresponding domain channel response value, H _3,2Be pilot sub-carrier P _3,2Corresponding domain channel response value,

Be pilot sub-carrier P _1,1The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _1,2The estimated value of corresponding domain channel response value,

Be pilot sub-carrier P _3,1The estimated value of corresponding domain channel response value, Be pilot sub-carrier P _3,2The estimated value of corresponding domain channel response value, ε ₁And ε ₂Be the physical quantity of setting, W _1,1Be pilot sub-carrier P _1,1The channel estimation errors that corresponding interference plus noise causes, W _1,2Be pilot sub-carrier P _1,2The channel estimation errors that corresponding interference plus noise causes, W _3,1Be pilot sub-carrier P _3,1The channel estimation errors that corresponding interference plus noise causes, W _3,2Be pilot sub-carrier P _3,2The channel estimation errors that corresponding interference plus noise causes.

9. device according to claim 8 is characterized in that, said operator module is used to use formula

Calculate the cross correlation value estimated value R of antenna m and antenna n _{Mn, Ns}, wherein,

As s=1,2,3 or 4 the time, When s=5 or 6,

Wherein, H _{L, k, m}Be the H of antenna m _{L, k}, H _{P, q, m}Be the H of antenna m _{P, q}, H _{L, k, n}Be the H of antenna n _{L, k}, H _{P, q, n}Be the H of antenna n _{P, q}, N representes to disturb and noise signal, and C representes the signal that receives, when s=1, l=1, k=1, p=1, q=2 is when s=2; L=3, k=1, p=3, q=2, when s=3, l=1, k=1, p=3; Q=1, when s=4, l=1, k=2, p=3, q=2, when s=5, l=1; K=1, p=3, q=2, when s=6, l=1, k=2, p=3, q=1.

10. device according to claim 9 is characterized in that said acquisition module is used to use formula R _{Mn, N}=R _{Mn, N1}+ R _{Mn, N2}+ R _{Mn, N3}+ R _{Mn, N4}-R _{Mn, N5}-R _{Mn, N6}Obtain said each element R _{Mn, N}

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